Drill-bit.



PATENTBD JUNE 30, 1908.

J. PATTEN & C. R. BARNETT.

DRILL BIT.

APPLICATION FILED MAY 23,1907.

3 SHEETS-SHEET 1.

l'msemor N8. 892,180. PATENTED JUNE so, 1908. J. PATTEN & G.-'R.BARNETT. DRILL BIT.

APPLIUATION FILED MAY 2311807.

3 SHEETS-SHEET 2.

I I I 1 I No. 892.180. PATENT-ED JUNE so, 1908.

J'. PATTEN 5; 0. R. BARNETT.

DRILL BIT.

APPLICATION FILED MAY 23.1907.

3 SHEETS-SHEET 3.

, 4 2 zw w x pnnrrnn stunts 'tni fiti clinics.

JOHN PATTENf' OF BALTIMURE, ADlDCl-IARLES It. BARXETT, Ol ROLA YD PARK,IliAl-KYLANI).

Application .E'iitd lsy 23, 1997. Serial No. 375,352.

. provision of a cutting member for a drill for use in Working stone,brick, concrete or other hard substances, and rvlnt's particularly tothe end 053cm drill mi. 'lhrg-r the form of tho cutting member, and themeans for supporting and directing it.

filostof t-he rock drills now in use havc a chiselliitjfe'ltllfif.Slllfllt or double. towed on hits when inus u'ot dnllquickly, psrtiicui the winners and must ho removed 1 encd 'i)\"-it'blacksmith at the. cost of great trouhls and miponse. iv

Thu out"- Iuoiiilw her in f mounted to i'no'i'c vii-l u;- drill mu, sothat the cutting: vugv is from tini'e to time (litlervutly prcsinlard tothe material and tends to be n turally abraded.

In the ombodin cnt ol tho invention spc-v L ,riczilly (lQSCIll-JQCl,part/only oi the cutting edge. is brought into Contact with thelililtfl;

riiil gny onc stroke, so that as the position of the cutter changes inrelation to the: shank during the oporution oi the machine, time ortion.of the cutting edge is constantly eing brought to bear upon thehint-stint so that the WQM" distributed over an Pdgc of greaterextentthan in the (use of a tool havingn fuced cutting nienihor," Thelife ol the cutting mmnhcr s thus int-roused, so thnt tho drill need nothe .v hdru. n. or its cutting. odgc renewed in h t in hole of modernlength. I Tho nonligui'ntiou oi. the cut-tilt member is such, that thedgo has no corner or portions of a shape pa ticularly suhjoot to FY6111;which are presented to t its material to .heconi's worn in advance ofother parts.

The cutting edge is of such shape that a nor tion of it is always sodisposed that cutting drop forgm i Sign: c'ificsrxtiozy oi LettersPatent, Patented June 30, 1908.

member showing a portion oi the shank in ul cross section andhul'f ofthe clevis,

is an elovzition of tho smnotaken at right angles to Fig. l, L portionottho shank lining l.l{)ii(:!l am li ing. 23 is a cross section taken ontho lino 3 B of Fig. ll Fig. 4 is a cross section on the line i -4 ofFig. 2. ll ig.

5 is a View ol 2). modiliontion (rorrcsi ionding to Fig. i. Fig. l} isan elevation o the some taken at right angles to 5. Fig. 7 is a verticalcross section of the SHIHQ modifica- -tion taken on the lino 7-7 of Fig.5, the cutting mon'iher hoing hrokon away to show in 'clcvmion the studupon which it is mounted. Fig. 8 is n cross section oi tho cutting mom'-her, of the some modification, taken on a. ilunc which includes theaxis. Fig. 9 is of aliugrziuuunticnl naluro and constitutes it d c--vllopimnt oltho cutting wig-:2 of tho modi- "limition shown in F'qs. (i,7 and S. Fig. ll) i ion on :1 plane including nu: .almol; in which two1"!"Z1il'ltifi rs mounted. 'i ig'. is s ol 1. shank and clovis inconnection. with which threccutliug members are ci'nploycd. Figs. 12 and123 show a. cutting -1ueml5i'rol' the type illustrated in Figs. 1-4dillcrcully mounted. Figs. '14 and 15 show still a notlicrinouns )t'f 'nescnting thoc'uttlng" from a convonivntsource. TllQ mid'otlho" rod orshank rmuote l'roni tluttntruhioli tho Figure 1 is a sidu clovation ol'thc cutting power is uppliod is nounturllored rind tapped iii. 3to-receive. in thrcndcd ongugomont tho shank-( l) of a, Clovis (5) whichhas ulongltuduinllt extending uporturo (6) ri'igistcrlng with thochannellQ) ol' tho shank ('1), and is stud (1].); so that whcn'it iswithdrawn from tudinal y except by removal of the clevis from itssocket.

Figs. 5 to 9 show a cutting member (15) having a cutting edge (16)which'is broken into port-ions (17-17) shown at right angles to eachother, though the portions of the cuttiny edge may be placed atanydesired angle ant are not necessarily continuous.

Figs. 10 and 11 show respectively 2- and 3 cutting members (13) mountedon. a single shank; by this arrangement a greater cutting surface isobtained by the use of a disk of given diameter, and the drill is betteradapt ed for operating on seaniy rock.

Figs. 12 and 13 show the invention adapted for use in connection with adrill which is supported by means of an external tube (18) within whichthe shank (i9) is mounted to recipro ate. The external diameter of theshank (i9) and of the clev'is mounted therein sli htly less than theinternal diameter of the tube (18) so that a passage-way (29) for waterto the surface oi the material being operated upon, is all'orded. Thelower portion of the tube is slotted at 21 to permit rcciprocation ofthe cutting member, which is of greater diameter than the tube. Theclevis (2-2) employed in connection with this modification is composedoi a single piece as distinguished from the s 7lih clevis of themodifications previously described, and the stud (23) upon which thecutting member is mounted, is not slmuldcred, but is an ordinary drivenpin. This construction is made possible by the presence of the tube(1.8) which prevents displacement of the stud.

Figs. 14 and 15 show the cutting member in use in connection with ahammer drill having a supporting tube (34) in which a rod or haunner(25) is mounted to reciprocate. This hammerv acts upon a drill shank(25) which is slottedut {27) to receive the circular cutter (28) mountedon. a stud (31) which maintained in position by means of the guid ingtube. '1. his tube is slotted at 29 to admit of sligl'it motion inrelation thereto of the cutting member which protrudes through the slotsfrom the tube. The space (30) between the tube and hammer and drillshank serves as a channel for water. In both the latter modificationsthe cutter is directed by means of the external tube, and is rotated bythis means about the longitudinal axis of the shank.

In the operation of the device, the cutter is extent of the cutting edgeis subs t1 eeepso presented to the work by means of shank upon which itis mounted, and in relation to which it is adapted to rotate. In some ofthe modifications shown, the cutter and. shank reciprocate on the lineof the longitudinal aXis of the latter, while in others the cutterremains in the bottom of the hole, i the bit ii which it is mounted isstruck series of blows by the drill rod, which acts ham. mer. In bothcases the cooperati e action. of the cutter and the material causes thefor mer to rotate relatively to the shank with the result that adifferent portion of the cutting edge is presented to the material ateach stroke, and the wear througlmut the entire lly uniform. W'e believethis rotzition is due to the fact, that as the cutter recipmcates thefirst resistance encountered is or; center:

therefore rotation in one direction or the u other is produced.

Because of the circular configuration of the cutting edge, part of it isoppositely disposed to that portion which acts on the material at theforward stroke of the drill, and as the shank is of less diameter thanthe cutter, some of this portion of the cutting edge is brought intooperation on the return stroke of the drill. The result is, that a drillprovided with this type of cutter may act on the material on both theforward and return strokes. This is of particular advantage, when piecesof stone become wedged behind the cutter, under which circumstances itcuts through the obstruction.

Undue -wear of the cutter during the return stroke, which is animportant element, and tends to greatly shorten the life of the drillbits of the type in common. use is prevented. to a large extent by therotation of the cutter. The latter yields rotatively and rolls along thesides of the hole, not being unduly worn in any one place.

The cutter, it will be noted, is of a shape which is easily made by dropforging, and may be turnedout in large numbers at small cost. Also theoperation of removing the cutter may be easily and quickly performed.These cutters are intended to be carried by the worlonen and changedfrequently, the old cutters being discarded, us delays on. account ofthe drill becoming cull ren dered both infrequent and of short duration.The small size of these cutters, and the small amount of material usedin their inanuiacture makes it advisable to make them of the finestmaterial and to teinper them uniformly.

Having thus set forth our invention in several forms in which it may beembodied, We do not wish to be understood as confining ourselves to thespecific details described.

What We claim and desire to secure by Letters Patent is 1. In a drill ashank having a circular cutter mounted to move relatively thereto, and

thereon provided with a cutting edge curved in a plane at right anglesto the axis of the journal bearing and adapted to be differentlypresented to the work at different periods of the operation of drilling.

3. In a drill a shank having a cutter journaled thereon to moverelatively thereto, and provided with a continuous cutting edge 50 thatthe position of the cutter is changed, by contact of the same with thematerial.

4. A drill shank having a cutting member journaled thereon to moverelatively thereto, so that the position of the cutting member ischanged by contact of the same with the material so that it isdifferently presented to the work at different stages of the operationof drilling the cuttingmember having a circular cutting edge.

5. In a drill a shank having a cutting member journaled thereon to moverelatively thereto, and provided with a continuous radial cutting edgeonly part of which is brought into operation at any one time, the

, .said cutting member'being adapted to be differently presented to thematerial at different stages of the operation of drilling, so

that as it is differently presented to the work different portions ofthe cutting edge are brought into operation.

6. In a drill a bit having a cutting member provided with a cutting edgeof curved outline, the said cutting member being j our naled' to move inrelation to the shank and means on the bit for supporting the cuttingmember whereby such motion is permitted.

7. In a drill a shank having a cutter mounted thereon rotatablerelatively thereto provided with a circular cutting etlge, and adaptedto present different portidns of/its cutting edge to' thematerial atdifferent periods of the operation of drilling. 8. A slotted clevis fora drill, a stud or shaft placed transversely of the slot andshouldered'to engage the clevis to take up end thrust, a cutter mountedon the stud to rotate relatively to the clevis, the clevis being dividedtransversely of the stud, and

means for holding the clevis and maintaining the two portions in normalposition.

9. A drill rod having a screw threaded socket in its extremity, a cleviscomposed of two separate members having a screw threaded shank to engagethe aperture in the rod, each member of the clevis being provided withan arm a ertured at its extremity, a stud having an en arged centralcylindrical portion and reduced extremities, the inner surface of thearms engaging the shoulders formed by the ends of the enlarged portion,

and a circular cutting member mounted on the stud to rotate relativelyto the rod.

10. In a drill, a clevis composed of two members, each member beingprovided with an arm apertured to form a bearing, a stud having anenlarged ccntralportion and reduced extremities journaled in thebearings the shoul 'crs formed by the extremities of the enlargedportion engaging the arms to take up the end thrust of the stud, acutter mounted on the stud intermediate of the arms, and means formaintaining the arms in operative relation.

11. In a drill, a drill rod, a circular cutting member having portionsofits cutting edge op ositely disposed longitudinally of the ro andadapted to cut during both the forward and return strokeof the drill.

12. A drill shank having a cutter mounted thereon, rotatable relativelythereto and adapted to present different portions of its cutting edge tothe material at dill'crent periods of the operation of drilling, the cutting edge being deflected in the direction of the axis of rotation so toincrease the extent of cutting edge on a cutter of given 13. A drillshank having a cutter mounted thereon rotatable relatively thereto, thecut ter being provided with a continuous cutting edge, which isdeflected from the plane of rotation, its length being therebyincreased.

-Signed by us at Baltimone, Maryland this 20th day of May 1907.

JOHN PATTEN. CHARLES R. BARNETT. Witnesses:

EDW'ARU -BASH, L. H. Lmm;

